You'd Look Better as a Ghost by Joanna Wallace

A comic thriller following the trials and tribulations of Claire, a part-time serial killer, who is keen to keep her favorite hobby a secret—despite the efforts of a determined blackmailer

The night after her father's funeral, Claire meets Lucas in a bar. Lucas doesn't know it, but it's not a chance meeting. One thoughtless mistyped email has put him in the crosshairs of an extremely put-out serial killer. But before they make eye contact, before Claire lets him buy her a drink—even before she takes him home and carves him up into little pieces—something about that night is very wrong. Because someone is watching Claire. Someone who is about to discover her murderous little hobby.

The thing is, it's not sensible to tangle with a part-time serial killer, even one who is distracted by attending a weekly bereavement support group and trying to get her art career off the ground. Will Claire finish off her blackmailer before her pursuer reveals all? Let the games begin . . .